メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((130.4250000 31.8208334, 130.4312500 31.8208334, 130.4312500 31.8250000, 130.4250000 31.8250000, 130.4250000 31.8208334)) ^^http://www.opengis.net/ont/geosparql#wktLiteral